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Tech discussion time !!! Sequential turbos??

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Old Dec 5, 2006 | 10:13 AM
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Default Tech discussion time !!! Sequential turbos??

OK, as i'm sat here bored, how do the sequential turbo's work on somthing like an RX7? I havn't really read much about it, but isn't there one small turbo for quick response and one big turbo for the top end power? do theese feed through each other or do they both feed the inlet manifold seperatly, and what is the limiting factor of ultimate power? is it the size of the small turbo or can you just have the small turbo bypassed once its up and running so the big one can flow enough air to make decent power?

Say on somthing like a cossie YB , whats stopping you having a T25 and a T4 on the same engine? I know space would be an issue but would there be enough gaslow to drive both turbines? I was thinking perhaps that you could use external wastegates and use the air from the small turbo wastegate to feed back into the large turbos turbine?
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Old Dec 5, 2006 | 10:15 AM
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Its two the same size on RX7s and Supras, 2 different sizes on some other cars.

A bit shit though, hence why its one of the first things they remove when modding RX7s and Supras.
Massivley complex and not that effective, so always binned off once at the limit of them turbos.

Turbo technics did a similar thing for cossies years back IIRC.
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Old Dec 5, 2006 | 10:26 AM
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Loads of development hassle for minimal gains.

If you want to make your cossie less laggy and still mega reliable and make good power then you need:


One of these to put your YB in:



and then one of these to put in your car:
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Old Dec 5, 2006 | 11:32 AM
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why would I want to put my YB in a vauxhall?
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Old Dec 5, 2006 | 11:33 AM
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Originally Posted by RWD_cossie_wil
why would I want to put my YB in a vauxhall?
So it could be in something that doesnt have a crappy rear beam setup that cambers up when you try and launch like a shitty old sierra?
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Old Dec 5, 2006 | 03:57 PM
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Originally Posted by chip-3door
Originally Posted by RWD_cossie_wil
why would I want to put my YB in a vauxhall?
So it could be in something that doesnt have a crappy rear beam setup that cambers up when you try and launch like a shitty old sierra?
True, I suppose on most RWD vauxhalls this is all thats left of them now, so it wont have a rear beam at all

a vauxhall, yesterday.
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Old Dec 5, 2006 | 04:00 PM
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Originally Posted by RWD_cossie_wil
Originally Posted by chip-3door
Originally Posted by RWD_cossie_wil
why would I want to put my YB in a vauxhall?
So it could be in something that doesnt have a crappy rear beam setup that cambers up when you try and launch like a shitty old sierra?
True, I suppose on most RWD vauxhalls this is all thats left of them now, so it wont have a rear beam at all

a vauxhall, yesterday.
Yeah, if only they were well protected against rust like a ford sierra is

Why dont you just post saying "Hi, im RWD_cossie_wil and im a cock who hasnt got a clue about motor vehicles" it would be a lot easier than saying it in the roundabout way you are here
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Old Dec 5, 2006 | 04:09 PM
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Originally Posted by chip-3door
Originally Posted by RWD_cossie_wil
Originally Posted by chip-3door
Originally Posted by RWD_cossie_wil
why would I want to put my YB in a vauxhall?
So it could be in something that doesnt have a crappy rear beam setup that cambers up when you try and launch like a shitty old sierra?
True, I suppose on most RWD vauxhalls this is all thats left of them now, so it wont have a rear beam at all

a vauxhall, yesterday.
Yeah, if only they were well protected against rust like a ford sierra is

Why dont you just post saying "Hi, im RWD_cossie_wil and im a cock who hasnt got a clue about motor vehicles" it would be a lot easier than saying it in the roundabout way you are here
OHHHHH sombodys tired , personal insults after 6 posts put your dummy back in and take your own advice , it's called banter
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Old Dec 5, 2006 | 04:13 PM
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Originally Posted by RWD_cossie_wil
Originally Posted by chip-3door
Originally Posted by RWD_cossie_wil
Originally Posted by chip-3door
Originally Posted by RWD_cossie_wil
why would I want to put my YB in a vauxhall?
So it could be in something that doesnt have a crappy rear beam setup that cambers up when you try and launch like a shitty old sierra?
True, I suppose on most RWD vauxhalls this is all thats left of them now, so it wont have a rear beam at all

a vauxhall, yesterday.
Yeah, if only they were well protected against rust like a ford sierra is

Why dont you just post saying "Hi, im RWD_cossie_wil and im a cock who hasnt got a clue about motor vehicles" it would be a lot easier than saying it in the roundabout way you are here
OHHHHH sombodys tired , personal insults after 6 posts put your dummy back in and take your own advice , it's called banter

It was an observation not an insult, and it was said in a banterous manner
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